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Date: Wed, 31 Mar 2021 08:55:55 -0600
From: Jens Axboe <axboe@...nel.dk>
To: kernel test robot <oliver.sang@...el.com>
Cc: LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
Subject: Re: [block] 4c95131e3c: kernel_BUG_at_block/bio.c
On 3/31/21 2:13 AM, kernel test robot wrote:
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 4c95131e3cb8bbb08c3b370b4ae3611874b48be0 ("block: enable use of bio allocation cache")
> https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git io_uring-bio-cache
>
>
> in testcase: ocfs2test
> version: ocfs2test-x86_64-d802bf7-1_20210329
> with following parameters:
>
> disk: 1HDD
> test: test-reserve_space
> ucode: 0x21
>
>
>
> on test machine: 8 threads Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz with 16G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
>
>
> [ 47.859997] kernel BUG at block/bio.c:628!
> [ 47.860086] invalid opcode: 0000 [#1] SMP PTI
> [ 47.860167] CPU: 5 PID: 5042 Comm: mkfs.ocfs2 Not tainted 5.12.0-rc5-00060-g4c95131e3cb8 #1
> [ 47.860317] Hardware name: /DZ77BH-55K, BIOS BHZ7710H.86A.0097.2012.1228.1346 12/28/2012
> [ 47.860445] RIP: 0010:__bio_put (kbuild/src/consumer/block/bio.c:628 kbuild/src/consumer/block/bio.c:623)
> [ 47.860514] Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 f6 47 14 40 74 0f 8b 47 64 85 c0 74 0e f0 ff 4f 64 0f 94 c0 c3 b8 01 00 00 00 c3 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00
> All code
> ========
> 0: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
> 7: 00 00 00
> a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
> f: f6 47 14 40 testb $0x40,0x14(%rdi)
> 13: 74 0f je 0x24
> 15: 8b 47 64 mov 0x64(%rdi),%eax
> 18: 85 c0 test %eax,%eax
> 1a: 74 0e je 0x2a
> 1c: f0 ff 4f 64 lock decl 0x64(%rdi)
> 20: 0f 94 c0 sete %al
> 23: c3 retq
> 24: b8 01 00 00 00 mov $0x1,%eax
> 29: c3 retq
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
> 33: 00 00 00 00
> 37: 66 data16
> 38: 66 data16
> 39: 2e cs
> 3a: 0f .byte 0xf
> 3b: 1f (bad)
> 3c: 84 00 test %al,(%rax)
> ...
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
> 9: 00 00 00 00
> d: 66 data16
> e: 66 data16
> f: 2e cs
> 10: 0f .byte 0xf
> 11: 1f (bad)
> 12: 84 00 test %al,(%rax)
> ...
> [ 47.860801] RSP: 0018:ffffc9000d42fc88 EFLAGS: 00010246
> [ 47.860885] RAX: 0000000000000000 RBX: ffffc9000d42fe80 RCX: 0000000000000002
> [ 47.860998] RDX: ffff88841a9a4f00 RSI: ffff88841a9a4f00 RDI: ffff88841b721318
> [ 47.861109] RBP: ffff88841b721318 R08: ffff88841b721318 R09: 000000000002ab30
> [ 47.861221] R10: 00000000000002c8 R11: ffff88841f36a144 R12: ffff88841b721318
> [ 47.861352] R13: ffffffff81395875 R14: 00000000ffffffff R15: ffff88841a9a4f00
> [ 47.861464] FS: 00007f5c66517280(0000) GS:ffff88841f340000(0000) knlGS:0000000000000000
> [ 47.861590] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 47.861681] CR2: 000055d13280c000 CR3: 0000000414e82006 CR4: 00000000001706e0
> [ 47.861793] Call Trace:
> [ 47.861836] bio_put (kbuild/src/consumer/block/bio.c:646)
> [ 47.861888] __blkdev_direct_IO (kbuild/src/consumer/fs/block_dev.c:508)
> [ 47.861959] generic_file_direct_write (kbuild/src/consumer/mm/filemap.c:3473)
> [ 47.862037] __generic_file_write_iter (kbuild/src/consumer/mm/filemap.c:3661)
> [ 47.862113] blkdev_write_iter (kbuild/src/consumer/fs/block_dev.c:1719 kbuild/src/consumer/fs/block_dev.c:1693)
> [ 47.862181] new_sync_write (kbuild/src/consumer/fs/read_write.c:519 (discriminator 1))
> [ 47.862265] vfs_write (kbuild/src/consumer/fs/read_write.c:605)
> [ 47.862322] ksys_pwrite64 (kbuild/src/consumer/include/linux/file.h:45 kbuild/src/consumer/fs/read_write.c:713)
> [ 47.862381] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:46)
> [ 47.862443] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:112)
> [ 47.862526] RIP: 0033:0x7f5c66692a37
> [ 47.862586] Code: ff ff eb b6 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8d 05 c9 7c 0d 00 49 89 ca 8b 00 85 c0 75 10 b8 12 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 59 c3 41 55 49 89 cd 41 54 49 89 d4 55 48 89
Thanks for the report, I've fixed this up in the current branch and
pushed a new one out.
--
Jens Axboe
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